Active volcanoes in the world from 29/06/2011 to 05/07/2011

The Weekly Volcanic Activity Report is a cooperative project between the Smithsonian's Global Volcanism Program and the US Geological Survey's Volcano Hazards Program.
Updated every Week (mostly Wednesday), notices of volcanic activity posted on these pages are preliminary and subject to change as events are studied in more detail. This is not a comprehensive list of all of Earth's volcanoes erupting during the week, but rather a summary of activity of volcanoes that meet criteria discussed in detail in the "Criteria and Disclaimers" section. Carefully reviewed, detailed reports on various volcanoes are published monthly in the Bulletin of the Global Volcanism Network.

New Activity or Unrest

SOPUTAN Sulawesi 1.108°N, 124.73°E; summit elev. 1784 m
CVGHM reported that during June diffuse white plumes from Soputan rose 25-150 m. During 21 June-2 July seismicity increased, and on 2 July the Alert Level was raised to 3 (on a scale of 1-4). Visitors and residents were discouraged from going within a 6-km radius of the crater and climbing the volcano was prohibited. According to news articles, a CVGHM volcanologist reported that a Strombolian eruption that began on 3 July produced an ash plume that rose 6 km and drifted W. Ashfall impacted villages, trees, and vegetation downwind. Sam Ratulangi International airport in the capital of Manado was closed for three hours. Articles also stated that the Red Cross distributed about 31,000 masks to area residents. remark : based on our own findings, the eruption was nearly over 24 hours after it began.
Volcano description : The small conical volcano of Soputan on the southern rim of the Quaternary Tondano caldera is one of Sulawesi's most active volcanoes. During historical time the locus of eruptions has included both the summit crater and Aeseput, a prominent NE-flank vent that formed in 1906 and was the source of intermittent major lava flows until 1924.
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Kliuchevskoi volcano, Kamchatka, Russia - - image courtesy Smithsonian Institute

KLIUCHEVSKOI Central Kamchatka (Russia) 56.057°N, 160.638°E; summit elev. 4835 m
Based on information from the Yelizovo Airport (UHPP), the Tokyo VAAC reported that an eruption from Kliuchevskoi on 3 July produced a plume that rose to an altitude of 7 km (23,000 ft) a.s.l. and drifted E.
Volcano description : Kliuchevskoi is Kamchatka's highest and most active volcano. Since its origin about 6000 years ago, the beautifully symmetrical, 4835-m-high basaltic stratovolcano has produced frequent moderate-volume explosive and effusive eruptions without major periods of inactivity. Kliuchevskoi rises above a saddle NE of sharp-peaked Kamen volcano and lies SE of the broad Ushkovsky massif. More than 100 flank eruptions have occurred at Kliuchevskoi during the past roughly 3000 years, with most lateral craters and cones occurring along radial fissures between the unconfined NE-to-SE flanks of the conical volcano between 500 m and 3600 m elevation. The morphology of its 700-m-wide summit crater has been frequently modified by historical eruptions, which have been recorded since the late-17th century. Historical eruptions have originated primarily from the summit crater, but have also included numerous major explosive and effusive eruptions from flank craters.

Lokon-Empung volcano Sulawesi, Indonesia - image courtesy Smithsonian Institute

LOKON-EMPUNG Sulawesi 1.358°N, 124.792°E; summit elev. 1580 m
CVGHM reported that during 1-25 June white plumes rose 50-200 m above Tompaluan crater, in the saddle between the Lokon-Empung peaks. On 26 June a phreatic eruption ejected material that fell around the crater and produced a gray plume that rose 400 m above the crater rim and drifted N. Seismicity increased the next day and white plumes rose 50-200 m above the crater. The Alert Level was raised to 3 (on a scale of 1-4). Visitors and residents were prohibited from going within a 3-km radius of the crater.
Volcano description : The twin volcanoes Lokon and Empung, rising about 800 m above the plain of Tondano, are among the most active volcanoes of Sulawesi. Lokon, the higher of the two peaks (whose summits are only 2.2 km apart) has a flat, craterless top. The morphologically younger Empung volcano has a 400-m-wide, 150-m-deep crater that erupted last in the 18th century, but all subsequent eruptions have originated from Tompaluan, a 150 x 250 m wide double crater situated in the saddle between the two peaks. Historical eruptions have primarily produced small-to-moderate ash plumes that have occasionally damaged croplands and houses, but lava-dome growth and pyroclastic flows have also occurred.

KIRISHIMA Kyushu 31.931°N, 130.864°E; summit elev. 1700 m
Based on notifications from JMA, the Tokyo VAAC reported that on 29 June an eruption from Kirishima's Shinmoe-dake (Shinmoe peak) produced a plume that rose to altitudes of 1.8-2.4 km (6,000-8,000 ft) a.s.l. and drifted N.

NABRO Eritrea 13.37°N, 41.70°E; summit elev. 2218 m
A satellite image of Nabro acquired on 29 June showed a clear view of the caldera and the vent within the active crater near the middle of the caldera. Lava flows to the W, and within the crater (E and S of the vent), continued to be hot. A brown ash plume rose from the vent and drifted S.
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PUYEHUE-CORDON CAULLE Central Chile 40.590°S, 72.117°W; summit elev. 2236 m
OVDAS-SERNAGEOMIN reported that the eruption continued from the Cordón Caulle rift zone, part of the Puyehue-Cordón Caulle volcanic complex. During 29-30 June weather conditions prevented views of the eruption plume by cameras installed around the volcano as well as by satellite. On 1 July a white plume, possibly with lower ash content, rose 3 km above the crater and was observed in satellite imagery drifting 200 km N. News articles noted that flights in Argentina were disrupted.
During 2-4 July SERNAGEOMIN noted that dark gray plumes rose 2-4 km above the crater and were detected in satellite imagery drifting 200-900 km NW, N, and somewhat E. Although there were no new aerial observations, seismicity indicated that during 29 June-2 July the lava flow remained active, although to a lesser degree than during previous days. During 2-3 July seismic signals indicated that lava had stopped flowing or was emitted at a slower rate. The next day high-intensity tremor suggested that the lava flow was again active. On 5 July satellite imagery showed that the plume drifted N then NW. The Alert Level remained at 6, Red.
Sources: Servicio Nacional de Geología y Minería (SERNAGEOMIN)
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For the list of volcanoes with Ongoing activity, please click here

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